Methoxychlor

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Chemical Identification | General Product Information | Physical & Safety Data

Chemical Identification

Common Name

Methoxychlor

中文通用名

甲氧滴滴涕

IUPAC

1,1,1-trichloro-2,2-bis(4-methoxyphenyl)ethane

CAS

1,1′-(2,2,2-trichloroethylidene)bis[4-methoxybenzene]

CAS No.

72-43-5

Molecular Formula

C₁₆H₁₅Cl₃O₂

Molecular Structure

General Product Information

Category

Insecticides > Organochlorine insecticides

Activity

Insecticide

Physical & Safety Data

Physical Properties

Molecular weight:345.7; Physical form:Colourless crystals; ( tech., grey powder). Density:1.41 (25 °C); Composition:Tech. grade contains ×88% methoxychlor and ×12% related isomers. Melting point:89 °C; ( tech., 77 °C); Vapour pressure:Very low; Solubility:In water 0.1 mg/l (25 °C). Readily soluble in aromatic, chlorinated, and ketonic solvents, and vegetable oils. In chloroform and xylene 440, methanol 50 (all in g/kg, 22 °C).; Stability:Stable to oxidising agents and to u.v. irradiation. Reacts with alkalis, especially in the presence of catalytically-active metals, with loss of hydrogen chloride, but more slowly than DDT. Colour turns to pink or tan on exposure to light;

Toxicology

Oral:Acute oral LD₅₀ for rats 6000 mg/ kg. Percutaneous:Acute percutaneous LD₅₀ for rabbits >2000 mg/ kg; not a skin irritant. ADI:( JMPR) 0.1 mg/ kg b.w. [1987].

Environmental Profile

Ecotoxicology:
Birds:Acute oral LD₅₀ for mallard ducks >2000 mg/kg. Dietary LC₅₀ (8 d) for bobwhite quail and ring-necked pheasants >5000 mg/ kg diet.Daphnia: LC₅₀ (48 h) 0.00078 mg/l.Fish: LC₅₀ (24 h) for rainbow trout 0.052, bluegill sunfish 0.067 mg/l.

Environmental fate:
Animals:Degradation in animals is principally by O-dealkylation to the corresponding phenol and diphenol, and by dehydrochlorination to 4,4'-dihydroxybenzophenone (K. S. Kapoor, J. Agric. Food Chem., 1970, 18, 1145-1152; J. Soil: DT₅₀ in water c. 46 d.

Transport Information

Signal Word:CAUTION; Hazard Class:III(Slightly hazardous)